About the icom: Yea I find it out me too one hour ago (for this thread) but I can't find any documentation about which pin is what...
For the push-to-talk switch, you only need a little switch, you cut the positive wire, you plug the switch where you cut (one side of the wire on each pin of the switch) and it's done. But if you get a little switch that you need to press, get one that let the power go through it when you push it
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